For OpenDungeons we were thinking of fetching the news for the website from a specific sub-forum.
Using the link http://forum.freegamedev.net/feed.php?f=41 (Would probably want make a new sub-forum forum for this) seems to work, though it get's the last post rather than the first post of each topic. Also, it has the forum name in front of the topic title.
PHPBB seems to support this by specifying mode=news in the url according to http://www.phpbb.com/community/viewtopic.php?t=2029415, though, that doesn't work here. As it is a recent addition I guess the forums might not be the latest version? Or is it disabled?
Also, are there feed links on the forums anywhere?